Test: Test `Create db.table`, `Create Index on db.table`, `Drop db.table` and `Desc db,table`

**Is your feature request related to a problem? Please describe.**

https://github.com/4paradigm/OpenMLDB/issues/977 will support `Create db.table`, `Create Index on db.table`, `Drop db.table` and `Desc db,table`. So we are going to add related tests for the new features once #1173 has been merged.

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